High-speed motor-driven spindle



Jan. 22, 1929.

E. BRONNERT HIGH 'srsan MOTOR bmvsn srxmm' Filed Oct. 5, 1925 .ADAPTEDTO CARRY A 7 d /4.\-\\--\ T T in H o m l. 3 m y T QT wm mm a D. H m m.

v Patented Jan. 22, v

UNITED STATES nmn' BBONNEB'I, O! STBASSBUBG, FRANCE.

mon-srimn moron-Damn srmnm.

Application filed October 5, 1925,8er1a1 No. 60,636, and in France July15, 1925.

It frequently happens in various machines that a s indle arrangedvertically rotatesat very hig speed driving a tool orother devicemounted on its upper part. This is the case,

5 for'example, in the spindles of polishlng bobs, twisting frames andother such machmes or apparatus.

It is known that such spindles, thus arranged vertically and to which ahigh speed of rotation is'imparted, are subjected to vibration,particularly if. the device WhlCll they drive is of fairly considerablemass. Th1s v1- bration, the injurious effects, of which are well knownto engineers, (wear, distortion and even breakage), is due to the factthat theration of the whole system (comaxis of prising t e drivenspindle and the tool or other mass which it drives) does not co ncidewith the axis of rotation of the spindle itself. This invention has forits object to provide an improved arrangement for mountlng thesespindles or shafts which overcomes the d1sadvantage above referred to. Afurther object. is to provide an improved spinning centrifuge, that isto say, a centrifugal mach ne for driving vessels (known as spmmng potsor turbines) which serve to store artificial textiles. Another object-isto provide improved suspension means for such machines, permittinthespinning vessels .to be rotated at a muc greater speed than atpresent while yet ensuring the usual twist of from 100 to 120revolutions per metre and avoiding the vibrations which are so injuriousto the quality of the thread produced.

In carrying my invention into practice I provide the drivin rotor,mounted for rotation in the body 0% the motor with a hollow bore, inwhich the spindle is arranged, said 40 spindle extending throughsuchbore and be ing connected to the rotor at one end by a drlvingconnection such that when runmng it can deviate slightl from its normalposition in relation to t e rotor and set itself freely in the axis ofgyration of the rotating system in which it is included. Preferably themotor body or casing, as a whole, is car'- ried in a Cardan or likeyielding suspension.

The spindle pass a freel and co-axially through the hollo. tors aft tothe driving connection and isersufliciently elastic in itself, or isconnected to the hollow shaft of the rotor by devices which aresufliciectly elastic to permit of its necessary slight movement withinthe hollow rotor shaft.

This movement, combined with the selfrighting faculty possessed by thewhole system, (by reason of the Cardan suspension of the stator) has theeffect of permitting the spindle to set itself freely along the axis ofgyration. of the system (exactly like a top). This avoids the vibrationswhich derive from the unbalanced eriodic reactions.

Various subsi iary features of my invention are hereinafter particularlydescribed and set forth also in my statement of claim.

In the accompanying drawing is shown, diagrammatically a' preferredconstructional form of apparatus according to m invention,

the drawin showing an axial sectionthrough the whole evice.

Referring to this drawing; the numeral 1 designates a casing, in whichis fixed a small electric motor constituted by a stator 2, fixed to thesaid casing, and a rotor 3.

The rotor 3 has a hollow shaft 4, which is centred in ball bearings 5,6. Through the interior of the shaft 4 of the rotor passes the spindle7, on the end of which is fixed the 'tool or apparatus which is to bedriven with a rapid rotary movement, as for instance, a polishing bob ora spinning pot,

At its lower part the spindle is connected to the hollow shaft, throughfwhich it passes freely, by a' flexible or elastic member 8, which allowsit a certain amount of play.

At the up er part of the apparatus another elastic mem relatively to.the rotor.

In the mode of carrying out the invention illustrated in the drawing thedevices 8 and 9 are each constitutedb a hollow symmetrical revolvingbody,.pre erably of cylindrical or conical form, which hollow body haswalls which are thin enough to possess a certain amount of elasticity.

have slots 10 in them, which subdivide them into strips 11, so as to addstill more to the elasticity of this device.

At the lower end, one of the bosses 12 of Furthermore, the walls r 9serves to centre the spindle" the hollow body is fixed to the spindle 7,for

example, by means of aclampin screw 13, which grips a shoulder 14. Theot er boss 15 is rigidly attached to the hollow shaft A, by

' one of the means of a clamping screw '16, for example.

In the elastic device 9, which serves to guide the s indle in the rotorat the top end osses 17 of the device is ngidly connected to the rotoronto the body of'the motor.- Through the other boss 18 passes thespindle 7, which is adapted torotate freely in a ball bearing (not shownin the drawing).

In order to increase the capacity of the system for automatic centerinit is desirable to suspend the body from a ardan suspen- 'sion. In thedrawing numerals 19 designate a pair of trunnions fixed at diametricallyopposite points on the casing 1 and taking their. caring in a ring 20.This ring 20 isitself provided with trunnions 21 arranged in the same.horizontal plane as .the'trunnions 19 but at right angles to the latterand these trunnions 21 take their hearing in the outer Garden ringmember 22. It will be understood that with such device the spindle becomes self-centering and rotates without vibration. and without axial orradial "shake about the gyroscopic axis of the system.

Actually the foot of the spindle can move slightly under the reactingforces and, consequently, it sets itself in such a position that vstoutconstructipn, or electrically driven, not more than 5000 to tained.Furthermore,

. wlthout vibration at higher'speed, can absorb the periodicreactionsare zero or counterbalanced. 1

-With spindles of the typedescribed speeds of 7 to 8000 revolutions perminute can be obtained, whereas with a plain spindle of whethermechanically,

6000 revolutions\per minute, could be ata spindle revolving more metresof the thread ejected by the spindle. is thusincreased. The higher speedalso b0 mits of winding mn 'head and conveyed by the well known feeroller, whilst always ensuring the usual amount of twist. The efliciencyof the spindevelops a greater centrifugal force and perup the fine andcourse counts for wh1ch purpose, hitherto only abobbin could beemployed.

J mg, and aspindle member .at oneend What I claim is 1. In a highspeed-rotary machine, a casing having a stator element therewithin, arotor hollow shaft anti-y element provided with a' frictionally mountedfor rotation in said casfixedly connected toan extremityof the hollowshaft and extending from said point of con- 7 tion to said shaft. 7

. includingresilient guide means for. the

spindle permitting eviation thereof in rela- 2. In a spinning"centrifuge a verticalspindle, asp'mm'ng vessel carried on the top endthereof, a. surrounding said in .the casing, a rotor spindle, statorparts within said casing and a rotor having a hollow shaft journalled insaid casing, said spindle being located freely within said hollow shaftand having its lower end united to the lower end of said shaft.

3. In a hi h speed rotary machine, a vertical casing aving shafthearings in its upper and lower ends and stator parts locatedintermediate its ends, a hollow rotor-carrying shaft antifrictionallyjournalled in said bearings, avertical spindle extending through theboreof the shaft for carrying a rotating load, and means connecting saidspindle to said shaft in yielding centering position therewithin at theend remote from the load. I 4. An apparatus according to claim 3, havingmeans for resiliently guiding the vertical spindle at a point spacedfrom the end of the hollow shaft through which the former projects.

5. An apparatus according to clainr 3, having an elastic spindle guidemember spaced from and supported by the hollow rotor shaft through whichthe spindle extends. 1 6. In a hi h speed rotalyemachine, a verticalcasing avlng shaft 'arings adjacent its upper and lower ends and statorparts located' intermediate its ends a hollow rotorcarrying shaftjournalled in said bearings, resilient members mounted on the two endsof the hollow shaft and a vertical spindle ex.- tending through the boreof said hollow shaft, said spindle having one of its ends securedfixedly to one of the.resilient members While the other resilient memberembraces and guides said spindle intermediate its ends.

7. In the apparatus of claim 6 a resilient member consisting of a hollowsymmetrical body with thin elastic walls and having a ss to engage thehollow rotor shaft and a second boss bored to embrace the verticalspindle substantiall as specified.

8. In a high spec rotary machine the combination with a vertical casingand a Cardan suspension therefor of stator parts fixed; I

journalled for rotation in the casing, a vertical spindle and a drivingconnection between the rotor and the spindle,

such that said spindlecan, in rotating, execute a limitedgyratory-movement."

9. In. aspinnmgcentrifuge a vertical a spinning vessel earned on thetopend thereof, a casing Cardan suspension means' end lower ends of saidcasing and stator parts to one of the resilient members while theintermediate said bearin a hollow rotorother resilient member embracesand guides carrying shaft ournalle in said bearings, said spindleintermediate its ends,

10- resihent members mounted on the two ends Signed at Strassburg,France, this 21st day 5 of the hollow shaft and a spindle extending ofSeptember, 1925.

through the base of said hollow shaft, said spindle having one of itsends secured fixedly Dn. EMILE BRONNERT.

